ac3enc: halve the MDCT window size by using vector_fmul_reverse

This brings the encoder in-line with the rest of ours and saves
on a bit of memory.

1 files changed, 4 insertions, 1 deletions

diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c
index 4f1e181e0b..5ecef3b178 100644
--- a/libavcodec/ac3enc_template.c
+++ b/libavcodec/ac3enc_template.c
@@ -92,7 +92,10 @@ static void apply_mdct(AC3EncodeContext *s)
             const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE];
 
             s->fdsp->vector_fmul(s->windowed_samples, input_samples,
-                                 s->mdct_window, AC3_WINDOW_SIZE);
+                                 s->mdct_window, AC3_BLOCK_SIZE);
+            s->fdsp->vector_fmul_reverse(s->windowed_samples + AC3_BLOCK_SIZE,
+                                         &input_samples[AC3_BLOCK_SIZE],
+                                         s->mdct_window, AC3_BLOCK_SIZE);
 
             s->mdct.mdct_calc(&s->mdct, block->mdct_coef[ch+1],
                               s->windowed_samples);